不同投饲率对罗非鱼生长及养殖水质的影响

Effects of different feeding rates on growth ofTilapia mossambica and water quality

摘要: 设置2.0％、4.0％、6.0％和8.0％4 种投饲率，研究不同投饲水平对罗非鱼生长及养殖水质的影响。结果表明，小型试验水体养殖罗非鱼的相对增重率（WGR）和相对增长率（LGR）随着投饲率的升高呈现出先上升后下降的趋势，饲料效率（FE）则随投饲率的升高逐渐降低。模糊综合评价试验养殖水体水质结果显示，水质状态随投饲水平的升高而逐渐变差。研究认为，养殖50 g 左右的罗非鱼较适宜的投饲率为4.0％，该投饲水平能实现养殖对象较快生长和保持较好的水质。

Abstract: This study was designed to evaluate the effects of different feeding rates（2.0％，4.0％，6.0％，8.0％ offish body weight）on growth of Tilapia mossambica and water quality. The results showed that weight gain ratio（WGR）and length gain ratio（LGR）of T. mossambica in the small aquacultural environment increased at first and then decreasedwith the feeding rate increasing，while feed efficiency（FE）showed decreasing trend. Water quality was assessed byfuzzy comprehensive assessment（FCA）. The status of water quality was deteriorating with the feeding rate increasing.The results suggested that the optimal feeding rate of T. mossambica（body weight of 50 g）was 4.0％，which could bothpromote the rapid growth of fishes and maintain water quality well.